CN115464245B - Vacuum electron beam welding method for twinning induced high-plasticity steel and application thereof - Google Patents
Vacuum electron beam welding method for twinning induced high-plasticity steel and application thereof Download PDFInfo
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- 238000003466 welding Methods 0.000 title claims abstract description 214
- 238000010894 electron beam technology Methods 0.000 title claims abstract description 59
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 55
- 239000010959 steel Substances 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000002844 melting Methods 0.000 claims abstract description 9
- 210000001503 joint Anatomy 0.000 claims description 20
- 230000001133 acceleration Effects 0.000 claims description 15
- 230000004927 fusion Effects 0.000 claims description 13
- 239000012535 impurity Substances 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 abstract description 14
- 239000002184 metal Substances 0.000 abstract description 14
- 238000010521 absorption reaction Methods 0.000 abstract description 8
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- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000011572 manganese Substances 0.000 description 19
- 229910052748 manganese Inorganic materials 0.000 description 16
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- 239000000463 material Substances 0.000 description 9
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- 238000000137 annealing Methods 0.000 description 6
- 239000010953 base metal Substances 0.000 description 6
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K15/00—Electron-beam welding or cutting
- B23K15/0046—Welding
- B23K15/0053—Seam welding
- B23K15/006—Seam welding of rectilinear seams
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K15/00—Electron-beam welding or cutting
- B23K15/0046—Welding
- B23K15/0093—Welding characterised by the properties of the materials to be welded
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K15/00—Electron-beam welding or cutting
- B23K15/06—Electron-beam welding or cutting within a vacuum chamber
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K15/00—Electron-beam welding or cutting
- B23K15/0033—Preliminary treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K15/00—Electron-beam welding or cutting
- B23K15/0046—Welding
- B23K15/0053—Seam welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
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Abstract
The invention belongs to the technical field of manufacturing processes of light-weight energy-absorbing buffering components of automobiles, and particularly discloses a vacuum electron beam welding method of twinning-induced high-plasticity steel and application thereof. The welding method comprises preheating welding, positioning welding and deep melting welding. The welding method disclosed by the invention has the advantages of stable welding, uniform weld width, small splashing and full arc closing, the internal quality of the welding joint meets the requirement of a B-level weld of ISO13919-1, the plasticity and tensile strength of the welding joint are equivalent to those of a parent metal, the welding joint has a high energy absorption and buffering function equivalent to that of the parent metal, and the automobile anti-collision beam manufactured after welding and the automobile energy absorption and buffering part combined by applying the anti-collision beam have the advantages of light structure, high safety protection and the like.
Description
Technical Field
The invention belongs to the technical field of manufacturing processes of light-weight energy-absorbing buffer parts of automobiles, and particularly relates to a vacuum electron beam welding method of twinning-induced high-plasticity steel and application thereof.
Background
The lightweight design of the automobile anti-collision energy-absorbing buffer part is the direction in which people always pursue and develop at present, and twin induced high-plasticity steel (TWIP) has the characteristics of high strength, high plasticity, light weight and high impact energy absorption, and is one of the steel types which are researched at present.
The high carbon and high manganese twinning induced high plasticity steel type belongs to high carbon and high manganese steel, and when a conventional welding method is used, such as argon arc welding, the high heat input welding method can enlarge a heat affected zone of a welding joint and seriously damage the plasticity and strength of the welding joint, so that the welded part can not meet the actual requirements on the plasticity and strength of the welding joint, and the application of the steel type in the energy absorption and buffering fields of automobiles and the like is limited. Therefore, there is still a need to develop a new welding technology to meet the requirements of more fields for the performance of the high-carbon high-manganese twinning induced high-plasticity steel weldment.
Disclosure of Invention
Aiming at the problems of poor plasticity, low strength and the like of a twin-induced high-plasticity steel welding joint in the prior art, the invention provides a vacuum electron beam welding method of twin-induced high-plasticity steel and application thereof.
In order to achieve the purpose, the method specifically comprises the following technical scheme:
a vacuum electron beam welding method of twinning induced high plasticity steel comprises the following steps:
(1) Preparing for welding: butt-jointing the twinning induced high-plasticity steel weldment, placing the butt-jointed high-plasticity steel weldment into a vacuum chamber of a welding machine, and vacuumizing the vacuum chamber of the welding machine until the vacuum degree in the vacuum chamber is lower than 1 x 10 -4 mbar；
(2) Preheating and welding: carrying out electron beam defocusing preheating on a welding seam of the twinning induced high-plasticity steel weldment, wherein the electron beam defocusing preheating process comprises the following parameters: the welding speed is 5 mm/s-10 mm/s, the focusing beam current ranges from 2300mA to 2600mA, the electron beam current ranges from 10mA to 30mA, the deflection scanning of the electron beam is a sine wave, the scanning amplitude ranges from 2mm to 5mm, the frequency ranges from 500Hz to 1000Hz, and the acceleration voltage is 150KV;
(3) Positioning and welding: carrying out symmetrical tack welding on the welding seam of the twin induced high-plasticity steel weldment subjected to preheating welding, wherein the symmetrical tack welding process comprises the following parameters: the welding speed is 5 mm/s-15 mm/s, the focusing beam current is 2100 mA-2400 mA, the electron beam current is 2mA-5mA, and the acceleration voltage is 150KV;
(4) Deep fusion welding: carrying out deep fusion welding on the welding seam of the twin induced high-plasticity steel weldment after positioning welding, wherein the process of the deep fusion welding comprises the following parameters: welding speed is 5 mm/s-15 mm/s, focusing beam current ranges from 2050mA to 2350mA, electron beam current ranges from 5mA to 50mA, deflection scanning of an electron beam is circular wave, scanning amplitude ranges from 0.5 to 2mm, frequency ranges from 50 Hz to 1000Hz, and acceleration voltage is 150KV;
(5) And cooling the twinning induced high-plasticity steel weldment subjected to deep fusion welding to obtain a welded formed part.
The invention adopts vacuum electron beam welding parts to induce high-plasticity steel by twinning, wherein the vacuum electron beam welding has the characteristics of high energy density, large weld depth-width ratio and narrow welding joint heat affected zone, and the parameters of the welding process are further regulated and controlled, so that the welding process is stable, and finally, a welding formed part with uniform weld joint structure, high weld joint internal quality, high tensile strength of the welding joint and high plasticity is obtained.
As a preferable embodiment of the invention, the twinning induced high plasticity steel weldment obtained in the step (1) comprises the following chemical components: according to the mass percentage, 0.6-0.9 percent of C, 20-30 percent of Mn, 0.3-1.0 percent of Si, 0.3-1.0 percent of Al, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.3-0.6 percent of V, 0.2-0.5 percent of Nb, less than or equal to 0.1 percent of impurity and the balance of Fe.
The steel grade of the twinning induced high-plasticity steel weldment in the step (1) is ultra-high manganese TWIP steel, the specific preparation method is disclosed in patent document with publication number CN112695258A, and the steel belongs to high-carbon high-manganese twinning induced high-plasticity steel, and the main chemical components are as follows: 0.6-0.9% of Fe, 0.6-0.9% of C, 20-30% of Mn, 0.3-1.0% of Si and 0.3-1.0% of Al.
As a further preferable embodiment of the invention, the chemical components of the twinning induced high plasticity steel weldment obtained in the step (1) are as follows: according to the mass percentage, 0.7 percent of C, 20 percent of Mn, 0.5 percent of Si, 0.3 percent of Al, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.3 percent of V, 0.2 percent of Nb, less than or equal to 0.1 percent of impurity, and the balance of Fe.
The welding method provided by the invention has the advantages that the twinning induced high-plasticity steel is welded stably, the width of a welding seam is uniform, the splashing is small, the arc closing is full, the internal quality of a welding joint meets the B-grade welding seam requirement of ISO13919-1, the plasticity and tensile strength of the welding joint are equivalent to those of a base metal, and the welding joint is ensured to have a high energy absorption buffering function equivalent to that of the base metal.
In the step (1), the twinning induced high plasticity steel weldment has a thickness of 2 to 10mm, a length of 100 to 200mm and a width of 100 to 200mm.
As a further preferable embodiment of the present invention, in the step (1), the twinning induced high plasticity steel weldment has a thickness of 8mm, a length of 150mm and a width of 150mm.
In a preferred embodiment of the invention, in the step (1), the butt joint mode is I-type butt joint, and the butt joint weld gap is not more than 0.1mm.
The I-shaped butt joint is an I-shaped joint realized by a weldment during butt joint.
As a preferred embodiment of the present invention, in step (2), the process of electron beam defocusing preheating comprises the following parameters: the welding speed is 10mm/s, the focusing beam current is 2510mA, the electron beam current is 10mA, the scanning amplitude is 4mm, and the frequency is 600Hz.
The preheating welding aims to control the temperature of a welding seam area to be 80-150 ℃, so that the hydrogen in the welding seam can be effectively overflowed, the splashing in the welding process can be reduced, the welding seam width is uniform, the heat input of subsequent welding can be reduced, and the heat affected zone of a welding joint is further reduced.
As a preferred embodiment of the present invention, in step (3), the symmetric tack welding process includes the following parameters: the welding speed is 10mm/s, the focusing beam current is 2310mA, and the electron beam current is 3mA.
In a preferred embodiment of the present invention, in step (4), the process of the deep fusion welding comprises the following parameters: the welding speed is 10mm/s, the focusing beam current is 2300mA, the electron beam current is 20mA, the scanning amplitude is 0.8mm, and the frequency is 200Hz.
In the steps (2) to (4), the interval between the preheating welding step, the positioning welding step and the deep-melting welding step is 5 to 15 minutes.
In a preferred embodiment of the present invention, in steps (2) to (4), the interval between the preheating welding, the tack welding and the deep-fusion welding is 10 minutes.
The time interval can effectively homogenize the temperature of the welding line, ensure that the temperature of the welding line is not lower than 80 ℃, reduce the welding deformation and improve the performance of the weldment.
In a preferred embodiment of the present invention, the cooling time in step (5) is 60 to 480min.
As a further preferred embodiment of the present invention, the cooling time in the step (5) is 60min.
The welding forming piece made by the vacuum electron beam welding method of the twinning-induced high-plasticity steel can be applied to automobile light-weight energy-absorbing buffer parts, wherein the welding forming piece made by the high-carbon high-manganese twinning-induced high-plasticity steel made by the welding method can be used as an anti-collision beam and can play an effective buffer function.
Compared with the prior art, the invention has the following beneficial effects: the welding method disclosed by the invention has the advantages that the welding is stable, the width of the welding line is uniform, the splashing is small, the arc closing is full, the internal quality of the welding joint meets the requirement of a B-level welding line of ISO13919-1, the plasticity and the tensile strength of the welding joint are equivalent to those of a base metal, the welding joint is guaranteed to have a high energy absorption and buffering function equivalent to that of the base metal, and the automobile anti-collision beam manufactured after welding and the automobile energy absorption and buffering part combined by applying the anti-collision beam have the advantages of light structure, high safety protection and the like.
Drawings
Fig. 1 is a front view of a weld of a welded article according to example 1 of the present invention.
FIG. 2 is a cross-sectional view of a weld of a welded article according to example 1 of the present invention.
FIG. 3 shows the results of X-ray inspection of a welded article against a joint in example 1 of the present invention.
Fig. 4 is a test piece of the welded molded part in example 1 of the present invention, which is broken by the transverse mechanical tensile test of the butt joint.
FIG. 5 shows the results of transverse mechanical tensile test of the welded molded article butt joint (solid line) and the base material (dotted line) in example 1 of the present invention.
Detailed Description
To better illustrate the objects, technical solutions and advantages of the present invention, the present invention will be further illustrated by specific comparative examples and examples.
The twinning induced high-plasticity steel weldment related to the embodiment and the comparative example of the invention is ultrahigh manganese TWIP steel, and comprises the following chemical components: according to mass percentage, 0.6-0.9% of C, 20-30% of Mn, 0.3-1.0% of Si, 0.3-1.0% of Al, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.3-0.6% of V, 0.2-0.5% of Nb, less than or equal to 0.1% of impurities, and the balance of Fe. The specific preparation method of the ultra-high manganese TWIP steel refers to a patent document with a patent name of high-capacity smelting and component regulation and control method of the ultra-high manganese TWIP steel and a publication number of CN 112695258A. The steel grade of the parts to be welded in the examples 1 to 3 and the comparative example 1 comprises the following chemical components: the steel plate is characterized by comprising, by mass, 0.7% of C, 20% of Mn, 0.5% of Si, 0.3% of Al, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.3% of V, 0.2% of Nb, less than or equal to 0.1% of impurities and the balance of Fe, and a specific preparation method is disclosed in example 1 in patent document CN 112695258A.
Example 1
In the embodiment, two pieces of ultra-high manganese TWIP steel are used as parts to be welded for butt joint to carry out vacuum electron beam welding, wherein the thickness of the steel before welding is in an annealing state, the thickness of the steel is 8mm, the length of the steel is 150mm, and the width of the steel is 150mm;
the welding requirements are as follows: the weld penetration is more than 8mm;
the matched material is a base plate, wherein the base plate and the to-be-welded piece are made of the same material, and the base plate is 9mm thick, 150mm long and 8mm wide in an annealing state.
(1) Polishing the welding line to be welded and the metal surface within 40mm of the periphery by using fine sand paper dipped with alcohol to expose the metal luster, then cleaning the welding line and the metal surface with water, and then wiping the surface of the workpiece to be welded clean by using silk cloth dipped with alcohol to ensure that the metal surface has no impurities such as oil stains and the like;
(2) Butting and pressing the parts to be welded, ensuring that the gap between the two parts to be welded is not more than 0.1mm, realizing an I-shaped joint, placing a base plate on the back of a welding line, and pressing the base plate and the welding line together;
(3) Preparing for welding: putting the to-be-welded parts into a welding machine vacuum chamber after butt joint and pressing, and vacuumizing the welding machine vacuum chamber, wherein the vacuum degree in the vacuum chamber is lower than 1 multiplied by 10 -4 mbar；
(4) Preheating and welding: performing electron beam defocusing preheating on a welding line to be welded, wherein the welding speed during preheating is 10mm/s, the focused beam current is 2510mA, the electron beam current is 10mA, the electron beam deflection scanning is sine wave, the scanning amplitude is 4mm, the frequency is 600Hz, and the acceleration voltage is 150KV;
(5) Positioning and welding: after preheating welding, waiting for 10 minutes, and then carrying out symmetrical tack welding on a welding line to be welded, wherein the welding speed during tack welding is 10mm/s, the focusing beam current is 2310mA, the electron beam current is 3mA, no scanning waveform exists, and the acceleration voltage is 150KV;
(6) Deep fusion welding: after the positioning welding, waiting for 10 minutes, and then performing deep melting welding on a welding seam to be welded, wherein the welding speed of the deep melting welding is 10mm/s, the focused beam current is 2300mA, the electron beam current is 20mA, the electron beam deflection scanning is circular wave, the scanning amplitude is 0.8mm, the frequency is 200Hz, and the acceleration voltage is 150KV;
(7) The weld-molded article was cooled in a vacuum chamber for at least 60 minutes, after which the vacuum was released to obtain a weld-molded article.
The appearance of the welding seam of the welding formed part is shown in fig. 1 and fig. 2, and the surface of the welding formed part has no crack, and the welding seam has no crack, undercut or tattle.
X-ray flaw detection is carried out on the butt joint of the welded formed part, the result is shown in figure 3, the butt joint is found to have no internal quality defects such as air holes and cracks, and the welding seam grade reaches the grade B requirement of ISO 13919-1.
The butt joint is sampled according to GB/T2651-2008, and is compared with a base material (namely the ultrahigh manganese twinning induced high-plasticity steel plate which is not welded), and a transverse mechanical tensile test is carried out, and as shown in figure 5, the tensile strength of the welded butt joint is 1080MPa, and the elongation after fracture is 50.62%; the tensile strength of the base material was 1125MPa, and the elongation after fracture was 65%. Therefore, the welding joint prepared by the welding method has the plasticity and tensile strength equivalent to those of the base metal, and the welding joint is ensured to have the high energy absorption and buffering functions equivalent to those of the base metal.
According to the embodiment, the ultra-high manganese twinning induced high-plasticity steel welding formed part manufactured by the welding method is used for manufacturing the automobile anti-collision beam, and the automobile energy-absorbing buffer part formed by applying the anti-collision beam has the advantages of light structure, high safety protection performance and the like.
Example 2
In the embodiment, two pieces of ultra-high manganese TWIP steel are used as parts to be welded for butt joint to carry out vacuum electron beam welding, and the parts are in an annealed state before welding, and are 8mm in plate thickness, 150mm in length and 150mm in width;
the welding requirements are as follows: the weld penetration is more than 8mm;
the matched material is a base plate, wherein the base plate is the same as a to-be-welded part in material, and the base plate is 9mm in thickness, 150mm in length and 8mm in width in an annealing state.
(1) Polishing the welding line to be welded and the metal surface within 40mm of the periphery by using fine sand paper dipped with alcohol to expose the metal luster, then cleaning the welding line and the metal surface with water, and then wiping the surface of the workpiece to be welded clean by using silk cloth dipped with alcohol to ensure that the metal surface has no impurities such as oil stains and the like;
(2) Butting and pressing the parts to be welded, ensuring that the gap between the two parts to be welded is not more than 0.1mm, realizing an I-shaped joint, placing a base plate on the back of a welding line, and pressing the base plate and the welding line together;
(3) Welding preparation: putting the to-be-welded parts into a vacuum chamber of a welding machine after butt joint and pressing, vacuumizing the vacuum chamber of the welding machine, wherein the vacuum degree in the vacuum chamber is lower than 1 multiplied by 10 -4 mbar；
(4) Preheating and welding: performing electron beam defocusing preheating on a welding line to be welded, wherein the welding speed during preheating is 5mm/s, the focusing beam current is 2600mA, the electron beam current is 30mA, the electron beam deflection scanning is sine wave, the scanning amplitude is 2mm, the frequency is 1000Hz, and the acceleration voltage is 150KV;
(5) Positioning and welding: after preheating welding, waiting for 15 minutes, and then carrying out symmetrical tack welding on a welding line to be welded, wherein the welding speed during tack welding is 5mm/s, the focused beam current is 2400mA, the electron beam current is 5mA, and the acceleration voltage is 150KV;
(6) Deep fusion welding: after the positioning welding, waiting for 15 minutes, and then performing deep melting welding on a welding line to be welded, wherein the welding speed of the deep melting welding is 15mm/s, the focused beam current is 2350mA, the electron beam current is 10mA, the electron beam deflection scanning is circular wave, the scanning amplitude is 2mm, the frequency is 800Hz, and the acceleration voltage is 150KV;
(7) The weld-molded article was cooled in a vacuum chamber for at least 60 minutes, after which the vacuum was released to obtain a weld-molded article.
Example 3
In the embodiment, two pieces of ultra-high manganese TWIP steel are used as parts to be welded for butt joint to carry out vacuum electron beam welding, wherein the thickness of the steel before welding is in an annealing state, the thickness of the steel is 8mm, the length of the steel is 150mm, and the width of the steel is 150mm;
the welding requirements are as follows: the weld penetration is more than 8mm;
the matched material is a base plate, wherein the base plate and the to-be-welded piece are made of the same material, and the base plate is 9mm thick, 150mm long and 8mm wide in an annealing state.
(1) Polishing the welding line to be welded and the metal surface within 40mm of the periphery by using fine sand paper dipped with alcohol to expose the metal luster, then cleaning the welding line and the metal surface with water, and then wiping the surface of the workpiece to be welded clean by using silk cloth dipped with alcohol to ensure that the metal surface has no impurities such as oil stains and the like;
(2) Butting and pressing the parts to be welded, ensuring that the gap between the two parts to be welded is not more than 0.1mm, realizing an I-shaped joint, placing a base plate on the back of a welding line, and pressing the base plate and the welding line together;
(3) Preparing for welding: putting the to-be-welded parts into a welding machine vacuum chamber after butt joint and pressing, and vacuumizing the welding machine vacuum chamber, wherein the vacuum degree in the vacuum chamber is lower than 1 multiplied by 10 -4 mbar；
(4) Preheating and welding: performing electron beam defocusing preheating on a welding line to be welded, wherein the welding speed during preheating is 10mm/s, the focused beam current is 2300mA, the electron beam current is 10mA, the electron beam deflection scanning is sine wave, the scanning amplitude is 5mm, the frequency is 500Hz, and the acceleration voltage is 150KV;
(5) Positioning and welding: after preheating welding, waiting for 5 minutes, and then carrying out symmetrical tack welding on a welding line to be welded, wherein the welding speed during tack welding is 15mm/s, the focused beam current is 2100mA, the electron beam current is 5mA, and the acceleration voltage is 150KV;
(6) Deep fusion welding: after the positioning welding, waiting for 15 minutes, and then performing deep melting welding on a welding seam to be welded, wherein the welding speed of the deep melting welding is 5mm/s, the focused beam current is 2050mA, the electron beam current is 5mA, the electron beam deflection scanning is circular waves, the scanning amplitude is 0.5mm, the frequency is 100Hz, and the acceleration voltage is 150KV;
(7) The weld-molded article was cooled in a vacuum chamber for at least 60 minutes, after which the vacuum was released to obtain a weld-molded article.
Comparative example 1
According to the comparative example, two pieces of ultra-high manganese TWIP steel are used as parts to be welded to be butted for conventional argon arc welding, the parts are in an annealing state before welding, and the tensile strength of a welding joint after argon arc welding is 921MPa to 737MPa; the elongation after fracture is 28.79-20.07%.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (8)
1. A vacuum electron beam welding method of twinning induced high plasticity steel is characterized by comprising the following steps:
(1) Welding preparation: butt-jointing the twinning induced high-plasticity steel weldment, placing the butt-jointed high-plasticity steel weldment into a vacuum chamber of a welding machine, and vacuumizing the vacuum chamber of the welding machine until the vacuum degree in the vacuum chamber is lower than 1 x 10 -4 mbar；
(2) Preheating and welding: carrying out electron beam defocusing preheating on a welding seam of the twinning induced high-plasticity steel weldment, wherein the electron beam defocusing preheating process comprises the following parameters: the welding speed is 5 mm/s-10 mm/s, the focusing beam current is 2300 mA-2600 mA, the electron beam current is 10mA-30mA, the deflection scanning of the electron beam is sine wave, the scanning amplitude is 2-5mm, the frequency is 500-1000Hz, and the acceleration voltage is 150KV;
(3) Positioning and welding: carrying out symmetrical tack welding on the welding seam of the twin induced high-plasticity steel weldment subjected to preheating welding, wherein the symmetrical tack welding process comprises the following parameters: the welding speed is 5 mm/s-15 mm/s, the focusing beam current is 2100 mA-2400 mA, the electron beam current is 2mA-5mA, and the acceleration voltage is 150KV;
(4) Deep fusion welding: carrying out deep fusion welding on the welding seam of the twin induced high-plasticity steel weldment after positioning welding, wherein the process of the deep fusion welding comprises the following parameters: the welding speed is 5-15 mm/s, the focusing beam current ranges from 2050mA to 2350mA, the electron beam current ranges from 5mA to 50mA, the deflection scanning of the electron beam is circular waves, the scanning amplitude ranges from 0.5 to 2mm, the frequency ranges from 50-1000Hz, and the acceleration voltage is 150KV;
(5) Cooling the twinning induced high-plasticity steel weldment subjected to deep fusion welding to obtain a welding formed part;
in the steps (2) to (4), the interval between the steps of preheating welding, positioning welding and deep-melting welding is 5 to 15 minutes;
the twinning induced high-plasticity steel weldment obtained in the step (1) comprises the following chemical components: according to mass percentage, 0.6-0.9% of C, 20-30% of Mn, 0.3-1.0% of Si, 0.3-1.0% of Al, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.3-0.6% of V, 0.2-0.5% of Nb, less than or equal to 0.1% of impurities, and the balance of Fe.
2. The vacuum electron beam welding method for the twinning induced high plasticity steel as claimed in claim 1, wherein the thickness of the twinning induced high plasticity steel welding part in the step (1) is 2 to 10mm, the length is 100 to 200mm, and the width is 100 to 200mm.
3. The vacuum electron beam welding method of twin induced high plasticity steel according to claim 1 or 2, wherein in step (2), the electron beam defocusing preheating process comprises the following parameters: the welding speed is 10mm/s, the focusing beam current is 2510mA, the electron beam current is 10mA, the scanning amplitude is 4mm, and the frequency is 600Hz.
4. A vacuum electron beam welding method of twinning induced high plasticity steel as claimed in claim 1 or 2, wherein in step (3), the process of symmetric tack welding comprises the following parameters: the welding speed is 10mm/s, the focusing beam current is 2310mA, and the electron beam current is 3mA.
5. The vacuum electron beam welding method of twinning induced high plasticity steel according to claim 1 or 2, wherein in step (4), the process of the deep fusion welding comprises the following parameters: the welding speed is 10mm/s, the focusing beam current is 2300mA, the electron beam current is 20mA, the scanning amplitude is 0.8mm, and the frequency is 200Hz.
6. A vacuum electron beam welding method of twin induced high plasticity steel according to claim 1 or 2, wherein in step (1), the butt joint is type I butt joint, and the weld gap of the butt joint does not exceed 0.1mm.
7. A welded molded article characterized by being produced by the vacuum electron beam welding method for a twinning-induced high plasticity steel according to any one of claims 1 to 6.
8. Use of a weld profile in an automotive light weight energy absorbing bumper component, wherein the weld profile is according to claim 7.
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| US18/243,090 US20240139856A1 (en) | 2022-11-01 | 2023-09-06 | Method for vacuum electron beam welding of twinning-induced plasticity (twip) steel and use thereof |
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| US4063062A (en) * | 1974-10-28 | 1977-12-13 | Bbc Brown Boveri & Company Limited | Electron beam welding technique for joining two workpieces together |
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